Expansion-valve.



J. M. LARSON.

EXPANSION VALVE. APPLICATION FILED MAY 25, 1912.

I Patented June 6, 1916.

M m v a A w 1 1 v fl H W. 1 3 W\\\ r l v\ \HT/I/ V q m Mu ca N wk W h N wk UNITED STATES PATENT OFFICE.

JOHN M. LARSON, OF CHICAGO, ILLINOIS, ASSIGNOR T0 NATIONAL REGULATOR COM- IPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS. V

i EXPANSIbN-VALVE.

Application filed May 25, 1912. Serial No. 699,696.

To all whom it may concern:

Be it lmown that I, JOHN M. LARSON, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Expansionrvalves, of which the following and exact description, reference being had to the accompanying drawing, forming a part of this specification.

My invention'relates to improvements in expansion valves and has for its object the production of a valve that can be adapted for use with either air, gas or water and in connection with various industries.

A further object is the production of a device in which the expansible member is so formed as to operate efliciently in either direction after the valve is closed without deterioration or injury.

A further object is the production of a device of simple construction, which can be cheaply manufactured and not liable to get out of order.

These and such other objects as may hereinafter appear are attained by my device, an embodiment of which is illustrated in-the accompanying'drawings, in which Figure 1 represents a plan view ofmy device installed in connection with a gas engine; Fig. 2 represents a longitudinal view of my device partly in section; Fig. 3 represents a sectional view on the line 3-3 of Fig. 2, looking in the direction indicated by the arrows; and Fig. 4 represents a sectional view on the line 44 of-Fig. 2, looking in the direction indicated by the arrows.

Like numerals of reference indicate like parts in the several figures of the drawing.

Referring now to the drawings, 5 represents the outer cylindrical shell of the device on the ends of which are threaded s 6 and 7. An ordinary threaded extension is screwed in the outer end of the T 6 on which is screwed the head piece 9. An ordinary gasket 10 is placed'betw'een the head piece 9 and the flanged tail piece 11 and an ordinary union 12 is screwed on the head 9, holding the members Screwed into the'opposite end of the T 7 is a flanged head 13 having a dial 14 on'its outer face over which moves an indicator. 15 screwed on the end of the expansible rod 16, the end of this rod being screw- Specification of Letters Patent.

is a full, clear, concise,

together.

Patented Jae e, 191

threaded at its end 17 and passing through the central opening 18 in the head. On the opposite end of the rod 16 is screwed a valve 19, the tapering seats 20 of which are adapted to press against the valve seat 21 on the inner face of the head piece 9. The opening 22 in the valve into which the rod 16 screws extends clear through the valve but is restricted,as shown at.23, and a restriction screw 24 is screwed therein. This screw, at some point, is filed flat, slantingwise from a point close to the head extending to the end, as shown at 25, forming a passage that communicates with the reing with the passage through the restricted opening a small channel to permit leakage and insure circulation. The T 6 is provided with an opening 27 in which is fitted a screw plug 28 and the T 7 is also provided with a port or opening 29 through which fluid may be admitted into the valve.

The rod 16 is made preferably of some resilient expansible metal and'in order to take care of additional contraction after the valve is closed, one or more slits 30 are made in the rod, preferably through the center and the members 16, 16 are spread apart at the center of the slit, as shown clearly in Fig. 2, thus forming in effect a spring member which will spread apart and draw together as the rod contracts and expands after the valve is closed.

In Fig. 1 I have shown my expansible valve A in place on the water jacket of a gas engine B, the water outlet of the jacket being screwed into the port or opening 29 in the T 7. A thermometer or temperature registering device 32 is provided in the pipe 31 between the jacket and the expansion valve. A waste pipe 33 is screwed into the end of the tailpiece of the union or endof the valve. The water for the jacket is brought in through the water inlet 34. When this device is mounted in place, as

shown in Fig. 1, the adjustment screw or isset to regulate the tempera- As the main purindi'cator 15 ture of the outlet water.

' oil" through the waste ,inlet 34:.

r and the temperature y In my illustration it. is vessential that hot water be removed from the jacket andcooler water be substituted in its place. At the same time it is highly advantageous that the hotwater be utilizedand that'no excess water be thrown ofi where it may be Wasted unless the temperature of the water in the jacket is too high to perform its cooling function.

In the use of my device the adjustment screw being set for a certain temperature so long as the water within the jacket remains sufficiently cool to perform its purpose, the valve 19 remains closed. As soon, however, as the temperature of the water within the jacket rises above the required temperature the rod 16 expands, opening the valve and permitting the water to pass or to be collected and used for other purposes, the place of the water withdrawn from the jacket being taken by water admitted through the water The splitting of the rod does not in any sense impair its efficiency in that it does not permit the ready opening of the valve, while at the same time, when the valve is closed of the water within the the extra contraction after the valve has reached its seat simply results in bringing together the split members 16, 16", and does not bend or deform the rod as a whole. In ordinary cases the deforming of the rod often results in unseating the valve to a greater or less extent and rendering the, device ineflicient as well as often permanently impairing the efiiciency ofthe device, the deformed rodfailing to return to its original condition and position. I I have shown the rod as split in one place. I often find that T attain more .uniform results by putting two or tube becomes cold,

.more slits in the rod as the contraction of.

the metal is often better taken care of by the use of severalsplit portions. 1

In the drawing it is clearly. shown that with the valve open, the members .16 and 16 are distended and that the contraction closing the valve brings the members toward each other but does not entirely close the openin therebetween, thus leaving an opportunlty graph; the split rod serving as a compento run to the waste. This type'of valve is head, a valve seat screwed for taking care of the extra con-' traction described in the preceding paraand allow the water partly separated also of great value in steam and electric air compressors, electric transformers, and ma chines of this kind.

While I have shown a specific embodiment of my device and shown it with the valve closing inwardly, it is to be understood that I do not limit myself to this precise construction, as the valve can be used either inwardly or outwardly opening and used in connection with hot or cold liquid, and can be split or distended at a plurality of points throughout its length.

A furtheriuse to which my device may be put is in connection with hot water systems to use in heating residences and offices, it being a well known fact that often during the night the water gets excessively hot and practically boils in the pipes, causing waterhammer and often damaging the system. In cases of this kind one of my devices could be inserted in the hot water tank and set for a predetermined degree, and when the heated water reaches temperature the valve will open, permitting water to flow out through the waste opening into the sink or any place desired, the place of the water removedbeing of course filled by cold water from the supply. By this use of my device all danger of damageto the system is obviated and a constant temperature maintained. k

Figs. 1 and 2 a plug 28, This lhave shown in closing an outlet just below the waste.

said predetermined outlet maybe very useful if it is desiredto the sink or any place wherethe wateris required and the water used without in any way impairing the efficiency of the system, as the valve will alwaysbe in condition to be operated whether the water is being drawn from the outlet or not.

I claim:

1. An expansion valve, comprising a casing, a casing head, an expansible valve stem partly separated by a longitudinal slit one end of which is screwed into said casing on the opposite end of said casing, a valve mounted on said stem, and means for adjusting the position of said valve.

2. An expansion valve comprising a casing, a casing head, an expansible valve stem partly separated by a longitudinal slit one end of which is screwed into said casing head, a valve seat screwed on the opposite end of said casing, a valve mounted on said stem, and a restriction screw in the base of said valve, said stem and valve being provided with a assage from the interior of the casing to t e atmosphere.

3. An expansion valve,.comprising a casing, a casing head, an expansible valve stem by a longitudinal slit, one

end of which is screwed into said casing site end of said casing,

head, a valve seat screwed on the opposite end of said casing, a valve mounted on said stem, a restriction screw in the base of said valve, said stem and valve being provided with a passage from the interior of the easing to the atmosphere, and means for varying the area of said passage.

4. An expansion valve, comprising a easing, a casing head, an expansible valve stem partly separated by a longitudinal slit, one end of said stem being screwed into said casing head, a valve seat screwed on the opposite end of said casing, a valve mounted on said stem, and means for adjusting the position of said valve.

5. An expansion valve, comprising a casing, a casing head, an expansible valve stem partly separated by a longitudinal slit, one end of said stem being screwed into said casing head, a valve seat screwed on the oppoan inwardly seating valve mounted on said stem, and a restriction screw in the base of said valve, said stem and valve being provided with a passage from the interior of the casing to the atmosphere.

6. An expansion valve, comprising a casing, a casing head, an expansible valve stem partly separated by a longitudinal slit, one

end of said stem being screwed into said casing head, a valve seat screwed on the opposite end of said casing, an inwardly seating valve mounted on said stem, a restriction screw in the base of said valve, said stem and valve being provided with a passage from the interior of the casing to the atmosphere, and means for varying the area of said passage.

.7. An expansion valve, comprising a casing, a casing head, an expansible valve stem split intermediate of its ends, one end of said stem being screwed into said casing head, a valve seat screwed on the opposite end of said casing, an inwardly seating valve mounted on said stem, and means for adjusting the position of said valve.

8. An expansion valve, comprising a casing, a casing head, an expansible valve stem split intermediate of its ends, one end of said stem being screwed into said casing. head, a valve seat screwed on the opposite end of said casing, an inwardly seating valve mounted on said stem,

. screw in the base of said valve, said stem and stem valve being provided with a passage from I the interior of the casing to the atmosphere.

9. An expansion valve, comprising a casing, a casing head, an expansible valve stem split intermediate of its ends, one end of said being screwed into said casing head, a valve seat screwed on the opposite end of said casing, an inwardly seating valve mounted on said stem, a restriction screw in and a restriction thebase of said valve, said stem andvalve being provided with a passage from the interior of the casing to the atmosphere, and means for varying the area of said passage.

10. An expansion valve, comprising a casing, a casing head, an expansible valve stem one end of which is screwed into said casing head, said stem being split lengthwise and distended at various points throughout its length, a valve seat screwed on the opposite end of said casing, an inwardly seating valve mounted on said stem, and means for adjusting the position of said valve.

1 An expansion valve, comprising a casing, a casing head, an expansible valve stem partly separated by a longitudinal slit one end of which is screwed into said casing head, a valve seat screwed on the opposite end of said casing, a valve mountedon said stem, and a restriction screw in the base of said valve, said stem and valve being provided with a passage from the interior of the casing to the atmosphere.

12. An expansion valve, comprising a casing, a casing head, an expansible valve stem partly separated by a longitudinal slit, one end of said stem being screwed into said casing head, a valve seat screwed on the opposite end of said casing, a valve mounted on said stem, and means for adjusting the position of said valve. I

13. An expansion valve, comprising a easing, a casing head, an expansible valve stem split intermediate of its ends, one end of said stem being screwed into said casing head, a valve seat screwed on the opposite end of said casing, a valve mounted on said stem,

and means for adjusting the position of said.

valve.

14. An expansion valve, comprising a casing, a casing head, an expansible valve stem one end of which is screwed into said casing head, said stem being split lengthwise and distended at various points throughout its.

valve stem extending in the direction of.

movement of the valve and having a portion separated for yielding laterall the parts thereof being so disposed as to distended laterally ture.

In witness whereof, I have hereunto subscribed my name in the presence of two witnesses.

' JOHN M. LARSON. Witnesses:

E. R. KING,

0. E. KANE.

under varying degrees of tempera- 

